You'll need to change the `cpp-options` field in your .cabal file. You can do this conditionally by using a cabal flag. On 06/20/2018 02:16 AM, PY wrote:
Hello all,
I'm using conditional compilation:
#ifdef BLAH blahBlah #endif
And I want to define BLAH, but not in *.hs file. For example, with `stack` option or as environment variable... How can I do it? For example, `stack -DBLAH=1 build` or something else. I tried
stack build --flag='*:BLAH'
- no effect.
Also I tried
stack build --flag=my-library:BLAH
and get error that my-library package does not define flag BLAH. So, it's total secret for me how to make such thing (like we can do with gcc, make, etc) :-)
===
Best regards, Paul
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